package user;

import book.BookShelf;

public abstract class User {
    protected String userName;

    public User(String userName) {
        this.userName = userName;
    }
    //菜单
    public abstract int menu();
    //转移表的作用
    /*
    * 该方法用作调用方法*/
    public abstract void operation(int select, BookShelf bookShelf);
}
